Laser dry-type cleaning method and device for fingerprint film on glass surface of touch screen

Abstract

The invention discloses a laser dry-type cleaning method and device for a fingerprint film on the glass surface of a touch screen, and relates to the technical field of touch screen cleaning. The laser dry-type cleaning method for the fingerprint film on the surface of the touch screen glass comprises the following steps that a laser head is located above to-be-cleaned glass and used for enabling a laser beam to vertically enter the upper surface of the to-be-cleaned glass downwards; drawing a laser action area and a scanning path on the upper surface of the to-be-cleaned glass; the relative vertical height between the laser head and the to-be-cleaned glass is adjusted, so that the focal plane of the laser beam coincides with the upper surface of the to-be-cleaned glass; a cleaning mode of the laser is started, laser is output, and the laser head controls a cleaning laser beam to clean the fingerprint film on the upper surface of the to-be-cleaned glass according to the set scanning speed and the preset scanning path. According to the method, the fingerprint film on the glass surface can be effectively removed on the basis that the glass substrate is not damaged, and the method is low in process complexity, easy and convenient to operate and more environmentally friendly.

Description

Technical Field

[0001] This invention relates to the field of touch screen cleaning technology, and in particular to a laser dry cleaning method and apparatus for fingerprint film on the glass surface of touch screens. Background Technology

[0002] Touchscreens on mobile phones, tablets, car infotainment systems, elevator panels, and other electronic devices are repeatedly touched by fingers daily. Lipids secreted by skin glands (the main component), sweat, and external dirt, cosmetics, and dust mix and deposit within seconds, forming an optically visible fingerprint film. Studies have shown that this film, only tens of nanometers thick, is enough to increase visible light scattering by 3%-5%, forcing screen brightness to be increased by more than 10% to maintain the original visual effect. Simultaneously, the dielectric constant of grease is much higher than that of air, causing touch ICs to misjudge coordinates, with a drift of up to 0.5 mm. More insidiously, free fatty acids in fingerprint residue, after aging at 85℃ / 85%RH for 72 hours, can reduce Ag nanowire transparent electrodes, increasing sheet resistance by 20% and directly shortening panel lifespan. Therefore, "fingerprint-free" is no longer just an aesthetic appeal, but a shared necessity for improving the optical performance, touch accuracy, and reliability of electronic products. Traditional methods for removing the fingerprint film, such as chemical cleaning and ultrasonic cleaning, suffer from significant environmental pollution, substrate damage, and complex processes.

[0003] In view of the problems of the prior art, those skilled in the art urgently need a laser dry cleaning method and apparatus for fingerprint film on the glass surface of touch screens. Summary of the Invention

[0004] The purpose of this invention is to provide a laser dry cleaning method and apparatus for fingerprint film on the surface of touch screen glass, so as to solve the problems existing in the prior art. It can effectively remove fingerprint film pollution on the glass surface without damaging the glass substrate, and the process is less complex, easier to operate, and more environmentally friendly.

[0005] To achieve the above objectives, the present invention provides the following solution: This invention provides a laser dry cleaning method for fingerprint film on the surface of touch screen glass, comprising the following steps: placing the glass to be cleaned on a horizontal worktable, with a laser head positioned above the glass and used to direct the laser beam vertically downwards onto the upper surface of the glass; activating the laser's red light positioning mode and outputting a positioning beam to draw the laser action area and scanning path on the upper surface of the glass; adjusting the relative vertical height between the laser head and the glass to be cleaned so that the focal plane of the laser beam coincides with the upper surface of the glass; setting the laser cleaning process parameters; activating the laser's cleaning mode and outputting the laser, with the laser head controlling the cleaning laser beam to clean the fingerprint film on the upper surface of the glass according to the set scanning speed and preset scanning path; and automatically stopping the laser output after cleaning is completed.

[0006] In some embodiments, the method further includes: selectively returning to the step of setting the process parameters for laser cleaning to perform a second cleaning operation based on the surface condition of the cleaned glass.

[0007] In some embodiments, a Z-direction displacement control console is provided on the horizontal worktable. The Z-direction displacement control console includes a support platform, and the laser head is located on the support platform. The step of "adjusting the relative vertical height between the laser head and the glass to be cleaned" includes: using the support platform to drive the laser head to move vertically relative to the glass to be cleaned, so as to adjust the relative vertical height between the laser head and the glass to be cleaned.

[0008] In some implementations, in the step of "activating the red light positioning mode of the laser and outputting a positioning beam to draw the laser action area and scanning path on the upper surface of the glass to be cleaned": the laser action area and the scanning path are input through the controller, the position of the focal point of the positioning beam is adjusted, and the laser action area and the scanning path are drawn on the upper surface of the glass to be cleaned, wherein the laser action area covers the fingerprint film.

[0009] In some implementations, in the step of "setting the process parameters for laser cleaning": the corresponding process parameters are set by the controller according to the different fingerprint film contaminants on the upper surface of the glass to be cleaned.

[0010] In some implementations, the step of “inputting the laser action area and the scanning path via the controller” includes: drawing the laser action area and the scanning path in the graphical interface of the controller; and / or inputting parameters in the controller to define the laser action area and the scanning path.

[0011] In some implementations, in the step of "the laser head controls the cleaning laser beam to clean the fingerprint film on the upper surface of the glass to be cleaned according to the set scanning speed and the preset scanning path": the controller sends the preset electrical signal corresponding to the laser action area and the scanning path to the laser head, and the galvanometer system built into the laser head controls the cleaning laser beam to scan according to the electrical signal.

[0012] In some embodiments, the laser is a carbon dioxide laser, and the glass to be cleaned is transparent quartz glass.

[0013] In some embodiments, the cleaning laser beam is a continuous laser beam with a wavelength of 10.6 μm or 9.8 μm, the average output power of the cleaning laser beam is 10 W to 200 W, the scanning speed of the cleaning laser beam is 100 mm / s to 10000 mm / s, the overlap rate of the cleaning laser beam spot is 0.3 to 0.7, and the spot diameter of the cleaning laser beam is 0.76 mm to 1.5 mm.

[0014] The present invention also provides an apparatus for implementing the above-described laser dry cleaning method for fingerprint films on the surface of touch screen glass, comprising a laser, a laser head, a horizontal worktable, and a controller; the laser and the laser head are connected via optical fiber, and both the laser and the laser head are communicatively connected to the controller; the laser head includes an outer optical path frame and a collimating mirror, a first reflecting mirror, a second reflecting mirror, an X-direction scanning galvanometer, a Y-direction scanning galvanometer, and a focusing mirror arranged sequentially along the optical path within the outer optical path frame; the horizontal worktable is used to place the glass to be cleaned, and the laser head is located above the glass to be cleaned and is capable of moving vertically relative to the glass to be cleaned.

[0015] The present invention achieves the following technical effects compared to the prior art: This invention discloses a laser dry cleaning method and apparatus for fingerprint film removal on touch screen glass surfaces. The glass to be cleaned is placed on a horizontal worktable, ensuring it is level. A laser head directs a laser beam perpendicularly, projecting a circular spot onto the upper surface of the glass, thus improving the cleaning effect on fingerprint-contaminated areas. The laser's red light positioning function allows for pre-setting the laser action area and scanning path, ensuring precise coverage of the fingerprint-contaminated area. Adjusting the relative height between the laser head and the glass surface ensures the focal plane of the laser beam coincides with the upper surface. Precise control of energy output and irradiation time through set process parameters achieves fingerprint film removal without damaging the glass substrate. During the cleaning process, fingerprint film is removed according to the set process parameters and preset scanning path. This invention enables precise selection of the action area, achieving selective removal of fingerprint film. Non-contact cleaning avoids mechanical damage to the glass and is more environmentally friendly. It effectively removes fingerprint film from the glass surface without damaging the glass substrate, offering fast cleaning speed, high efficiency, low process complexity, simple operation, and good economic benefits. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a flowchart of the main steps of a laser dry cleaning method for fingerprint film on touch screen glass surface in some embodiments of the present invention; Figure 2 This is a schematic diagram of the structure of a laser dry cleaning device for fingerprint film on the surface of a touch screen glass in some embodiments of the present invention. Figure 3 This is a diagram showing the effect of using a laser dry cleaning method for fingerprint film on touch screen glass surfaces according to some embodiments of the present invention to clean the glass surface to be cleaned. In the diagram: 1-Laser; 2-Fiber optic cable; 3-Controller; 4-External optical path frame; 5-Output laser beam; 6-Collimating lens; 7-First reflecting mirror; 8-Second reflecting mirror; 9-X-direction scanning galvanometer; 10-Y-direction scanning galvanometer; 11-Focusing lens; 12-Cleaning laser beam; 13-Glass to be cleaned; 14-Laser cleaning area; 15-Fingerprint film; 16-Horizontal worktable; 17-Z-direction displacement control console; 18-Z-direction displacement control knob; 19-Displacement scale; 20-Supporting platform; 21-Communication cable. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] The purpose of this invention is to provide a laser dry cleaning method and apparatus for fingerprint film on the surface of touch screen glass, so as to solve the problems existing in the prior art. It can effectively remove fingerprint film pollution on the glass surface without damaging the glass substrate, and the process is less complex, easy to operate, and more environmentally friendly.

[0020] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] This invention provides a laser dry cleaning method for fingerprint film on the surface of touch screen glass, such as... Figure 1 As shown, the main steps include the following: Step S1: Place the glass 13 to be cleaned on the horizontal worktable 16, with the laser head positioned above the glass 13 to be cleaned and used to direct the laser beam vertically downwards onto the upper surface of the glass 13 to be cleaned. Step S2: Activate the red light positioning mode of laser 1 and output the positioning beam to draw the laser action area and scanning path on the upper surface of the glass 13 to be cleaned. Step S3: Adjust the relative vertical height between the laser head and the glass 13 to be cleaned so that the focal plane of the laser beam coincides with the upper surface of the glass 13 to be cleaned; Step S4: Set the process parameters for laser cleaning; Step S5: Start the cleaning mode of laser 1 and output laser. The laser head controls the cleaning laser beam 12 to clean the fingerprint film 15 on the upper surface of the glass 13 to be cleaned according to the set scanning speed and preset scanning path. Step S6: After cleaning is completed, laser 1 automatically stops outputting laser light.

[0022] It should be noted that the principle of this invention is that when a laser beam irradiates the surface of the glass 13 to be cleaned, which is covered with a fingerprint film 15, the laser energy is absorbed, and the temperature of the grease and the glass surface rises instantaneously. When the temperature of the grease exceeds a certain value, physical and chemical reactions occur, causing the grease to detach from the substrate surface. For example, when the temperature rises to 373K, the main component of human epidermal sebum, triglycerides, will change from a liquid state to a gaseous state, overcome the surface adhesion, detach from the glass surface, and enter the air. Triglycerides will also react with oxygen in the air, producing a combustion phenomenon. The chemical bonds in the grease are directly broken by photons, generating carbon dioxide and water vapor. These two gases are very common in the atmospheric environment and are safe and harmless to the environment. This invention aims to solve the problems of existing cleaning methods in removing the fingerprint film 15 from the surface of the glass 13, such as easy environmental pollution, easy damage to the substrate, low cleaning efficiency, and high process complexity.

[0023] In some embodiments, the method further includes: Step S7: Depending on the surface condition of the glass 13 to be cleaned after cleaning, selectively return to step S4 for a second cleaning operation.

[0024] In some embodiments, such as Figure 1 As shown, a Z-direction displacement control console 17 is provided on the horizontal worktable 16. The Z-direction displacement control console 17 includes a support platform 20 that can move in the vertical direction, and the laser head is located on the support platform 20. The step of "adjusting the relative vertical height between the laser head and the glass 13 to be cleaned" includes: The support platform 20 is used to move the laser head vertically relative to the glass 13 to be cleaned, thereby adjusting the relative vertical height between the laser head and the glass 13 to be cleaned.

[0025] In some embodiments, in step S2 above: the laser action area and scanning path are input through the controller 3, the position of the focal point of the positioning beam is adjusted, and the laser action area and scanning path are drawn on the upper surface of the glass 13 to be cleaned. The laser action area can cover the fingerprint film 15.

[0026] In some embodiments, in step S4 above: the corresponding process parameters are set by the controller 3 according to the different fingerprint film contaminants on the upper surface of the glass 13 to be cleaned.

[0027] It is understandable that, since there are many types of grease that may cause contamination on the surface of the glass 13 to be cleaned, different laser process parameters can be selected to obtain better cleaning results depending on the different grease contaminants on the glass 13 to be cleaned.

[0028] In some embodiments, the step of "inputting the laser action area and scanning path via controller 3" includes: Draw the laser action area and scanning path in the graphical interface of controller 3; and / or input parameters in controller 3 to define the laser action area and scanning path.

[0029] In some embodiments, in the step of "the laser head controls the cleaning laser beam 12 to clean the fingerprint film 15 on the upper surface of the glass 13 to be cleaned according to the set scanning speed and preset scanning path": The controller 3 sends the electrical signals corresponding to the preset laser action area and scanning path to the laser head. The galvanometer system built into the laser head controls the cleaning laser beam 12 to scan according to the electrical signals.

[0030] In some embodiments, laser 1 is a carbon dioxide laser, and the glass 13 to be cleaned is transparent quartz glass.

[0031] In some embodiments, the cleaning laser beam 12 is a continuous laser beam with a wavelength of 10.6 μm or 9.8 μm, the average output power of the cleaning laser beam 12 is 10 W to 200 W, the scanning speed of the cleaning laser beam 12 is 100 mm / s to 10000 mm / s, the overlap rate of the cleaning laser beam 12 spot is 0.3 to 0.7, and the spot diameter of the cleaning laser beam 12 is 0.76 mm to 1.5 mm.

[0032] It should be noted that this invention achieves efficient and precise cleaning of fingerprint films on transparent quartz glass surfaces by precisely adjusting laser parameters and external optical path configuration. Simultaneously, by adjusting the distance of the Z-direction displacement control console 17, the laser energy is directed solely to the fingerprint film 15 on the transparent quartz glass surface, without damaging the transparent quartz glass substrate. Furthermore, transparent quartz glass has high reflectivity to 10.6μm wavelength lasers, a characteristic that ensures the transparent quartz glass is not damaged during cleaning and does not experience negative impacts such as decreased optical performance. Therefore, this invention is particularly suitable for cleaning glass components such as screens of optical instruments and electronic devices where extremely high optical performance is required. Moreover, this invention designs a cleaning device including a 10.6μm wavelength carbon dioxide laser, a two-dimensional galvanometer system for the external optical path, a worktable, and a computer control system. This device can adapt to the cleaning needs of fingerprint films 15 on transparent quartz glass surfaces of different sizes and shapes, and is particularly suitable for large-scale automated production lines.

[0033] The laser dry cleaning method for fingerprint film on touch screen glass surface of the present invention specifically includes the following steps: Step S101: Place the glass 13 to be cleaned on the horizontal worktable 16 and use a clamp to stabilize it, ensuring that the glass 13 to be cleaned is in a horizontal state so that the laser beam is incident at 90°.

[0034] Step S102: After completing the preliminary inspection of the equipment, start the red light positioning function of the laser 1, adjust the position of the laser focus on the controller 3, draw the laser action area and the internal scanning path, and ensure that the laser action area accurately covers the fingerprint film contamination area.

[0035] Step S103: Set process parameters. The output mode of laser 1 is set to continuous mode. The laser cleaning process parameters can be set on controller 3. The set parameters and ranges are as follows: average laser output power of 10W ~ 200W, laser scanning speed of 100mm / s ~ 10000mm / s, and laser spot overlap rate of 0.3 ~ 0.7. The beam defocusing amount can be set on Z-direction displacement control console 17, with an adjustable range of +30mm ~ -30mm.

[0036] Step S104: Start the cleaning mode of laser 1. The scanning galvanometer system built into the laser head is activated, and laser 1 begins to emit a continuous laser beam. The laser dry cleaning process of fingerprint film contaminants then begins.

[0037] Step S105: After the laser completes the cleaning work according to the set scanning speed and predetermined scanning path, the laser 1 automatically stops outputting laser light, and the galvanometer system built into the laser head stops working.

[0038] Step S106: Remove the cleaned glass from the horizontal worktable 16, observe the cleaning effect, and repeat steps S103 to S105 according to the surface condition after cleaning to complete the laser dry complete cleaning process of fingerprint film contamination on the surface of a single piece of glass 13 to be cleaned.

[0039] Step S107: Repeat steps S101 to S106 to complete the fingerprint film cleaning of the next glass 13 to be cleaned.

[0040] Based on steps S101 to S107 above, it should be noted that the operator can draw the required laser scanning path in the laser external control software of the controller 3 according to actual needs. These paths can be straight lines, curves, circles, or other complex geometric shapes, depending on the processing or cleaning task to be performed. In the software, the operator can define the laser's effective area and scanning path through a graphical interface or by inputting parameters. For example, if a specific area on a glass surface needs to be cleaned, the operator can draw the outline of this area in the software and set the start and end points of the laser scan, as well as the shape and direction of the path.

[0041] The scanning galvanometer system is a key component in laser equipment used to control the laser beam path. It consists of two mutually perpendicular mirrors, responsible for scanning in the X and Y directions respectively. These two scanning galvanometers can deflect rapidly and precisely under the drive of electrical signals. The laser's external control software converts the drawn path and set parameters into electrical signals, which are then sent to the scanning galvanometer system's driver. The driver controls the deflection angle and speed of the scanning galvanometers according to the instructions of the electrical signals. For example, when the laser needs to move along the X direction, the X-direction scanning galvanometer deflects by the corresponding angle according to the electrical signal, thereby changing the direction of the laser beam path. Through the deflection of the scanning galvanometers, the direction and position of the laser beam can be precisely controlled. In this way, the laser can scan and act on the surface of an object according to the path set in the software. For example, when cleaning a glass surface, the laser beam will irradiate the glass surface point by point or line by line according to the set path to remove surface grease.

[0042] The Z-direction displacement control console 17 is primarily used to adjust the focal plane position of the laser beam. During laser processing or cleaning, the focal position of the laser beam is crucial, as it determines the concentration and effectiveness of the laser energy. The Z-direction displacement control console 17 allows for precise adjustment of the laser beam's focal point, ensuring it coincides with the surface to be cleaned or processed. In practice, operators adjust the laser beam's focal point using the Z-direction displacement control console 17 based on the location and shape of the surface to be cleaned. For example, if the upper surface of the glass 13 to be cleaned is flat, the operator will adjust the laser beam's focal point to the glass surface; if the upper surface of the glass 13 to be cleaned is curved, the focal position may need to be adjusted multiple times depending on the location to ensure that the laser energy effectively acts on the surface.

[0043] This invention is suitable for removing oily contaminants secreted by the human skin, and has a significant cleaning effect. For example... Figure 3 The experimental results shown depict artificial oils (with a composition ratio of triglycerides: isostearic acid: squalane = 59:24:17) that simulate human sebum as the test contaminant. This experiment achieved highly efficient cleaning under the following laser process parameters: defocusing amount set to 0mm, overlap rate set to 0.5, laser power selected as 100W, and scanning speed selected as 1000mm / s ~ 2000mm / s. Figure 3 The area within the square frame is the laser cleaning area; the part inside the square frame is the surface after cleaning, and the part outside the square frame is the surface before cleaning.

[0044] The present invention also provides an apparatus for implementing the above-described laser dry cleaning method for fingerprint films on the surface of touch screen glass, such as... Figure 2As shown, the device includes a laser 1, a laser head, a horizontal worktable 16, and a controller 3; the laser 1 and the laser head are connected via an optical fiber 2, and both the laser 1 and the laser head are communicatively connected to the controller 3; the laser head includes an outer optical path frame 4 and a collimating mirror 6, a first reflecting mirror 7, a second reflecting mirror 8, an X-direction scanning galvanometer 9, a Y-direction scanning galvanometer 10, and a focusing mirror 11 arranged sequentially along the optical path within the outer optical path frame 4; the horizontal worktable 16 is used to place the glass to be cleaned 13, and the laser head is located above the glass to be cleaned 13 and can move vertically relative to the glass to be cleaned 13. Figure 2 In the middle, the upper surface of the glass 13 to be cleaned includes a laser cleaning area 14 and a fingerprint film 15.

[0045] The laser dry cleaning device for fingerprint films on touch screen glass surfaces of the present invention includes a laser 1, an optical fiber 2 and an external optical path frame 4, a horizontal worktable 16, a Z-direction displacement control console 17, and a controller 3. The laser 1 is a carbon dioxide laser with a maximum output power of 200W, an adjustable repetition frequency range of 0-100kHz, a beam quality <1.2, and a spot diameter of 0.76mm~1.5mm. The laser 1 has a red light guiding function, and the output laser beam 5 can be transmitted to the external optical path via the optical fiber 2. The external optical path includes an aluminum alloy external optical path frame 4, two reflectors, a collimating lens 6, a focusing lens 11, and a set of XY-direction controllable galvanometer systems. The laser beam is transmitted to the galvanometer system through the two reflectors. The controller 3 can control the reflection angles of the two reflectors in the galvanometer system, allowing scanning along the X and Y directions respectively, thereby achieving laser beam deflection. The laser beam is converted into parallel light by the collimating lens 6 and then focused to the focal point by the focusing lens 11.

[0046] The horizontal worktable 16 includes an area for loading the glass 13 to be cleaned. The area for loading the glass 13 has fixtures that can fix glass 13 of different sizes onto the worktable surface and keep the upper surface of the glass 13 (i.e., the surface contaminated by the fingerprint film 15) horizontal. A displacement scale 19 on the Z-direction displacement control console 17 is connected to a support platform 20 on the laser head. The Z-direction displacement control console 17 has a digital scale, and the vertical height of the laser head can be controlled by adjusting the Z-direction displacement control knob 18, thereby changing the defocus of the laser beam relative to the upper surface of the glass 13 to be cleaned, and thus adjusting the size of the area affected by the laser on the fingerprint film contaminant.

[0047] The controller 3 consists of a control computer and two communication cables 21. It is connected to the laser 1 and the galvanometer system in the external optical path through the communication cables 21. The control computer can send electrical signals to adjust the power of the laser beam output by the laser 1 and the scanning speed, so as to achieve precise control of the fingerprint film removal process 15.

[0048] The laser dry cleaning method and apparatus for fingerprint film on touch screen glass surfaces of the present invention have the following beneficial effects: Highly efficient and fast. By configuring the laser process parameters, a single laser scan can effectively remove grease and contaminants from the glass surface, achieving a cleaning removal rate of over 99%, demonstrating higher cleaning efficiency and better cleaning results.

[0049] The substrate remains undamaged. The small diameter of the output light spot in this invention, through precise control of energy output and irradiation time, enables accurate cleaning of human sebum on the surface of the glass 13 to be cleaned. It removes only oily contaminants without damaging the glass substrate itself or affecting its optical properties, a feat difficult to achieve with traditional cleaning methods. For example, the precision of this invention is significantly advantageous in cleaning glass components such as optical instruments and electronic device screens, where extremely high optical performance is required.

[0050] Dry cleaning. This invention eliminates the need for any chemical cleaning agents or solutions, avoiding the environmental pollution problems that chemical cleaning may cause, while also reducing wastewater treatment costs and health hazards to operators. For some chemically sensitive glass products, such as optical glass and electronic glass, dry cleaning ensures that they are not corroded by chemicals.

[0051] Non-contact cleaning. This invention is a non-contact cleaning method that avoids scratches and abrasions on the glass surface that can occur with traditional cleaning methods due to physical contact. During the cleaning process, the laser beam does not have direct mechanical contact with the glass surface, thus avoiding any negative impact on the surface structure and properties of the glass. For glass products with fragile or easily damaged surfaces, this non-contact cleaning method provides important protection.

[0052] Easy to automate. This invention can be combined with an automated control system to achieve precise control and automated operation of the cleaning process. By programming and setting parameters, the laser cleaning equipment can clean according to a predetermined program and trajectory, improving the consistency and stability of cleaning, reducing errors and labor intensity of manual operation, and making it suitable for large-scale application on industrial production lines.

[0053] Wide applicability. This invention is applicable to glass products of different shapes, sizes, and types. Whether it is flat glass, curved glass, small glass parts, or large glass panels, effective cleaning can be achieved by adjusting the laser parameters and irradiation method, demonstrating strong versatility and applicability.

[0054] In some alternative embodiments, the present invention may replace laser 1 and external optical path with other laser types and corresponding external optical path settings.

[0055] In some alternative embodiments, the design and functionality of the Z-direction displacement control console 17 of the present invention can be improved and enhanced in various ways.

[0056] In some alternative embodiments, the upper surface of the glass 13 to be cleaned is curved. During the cleaning process, the relative vertical height between the laser head and the glass 13 to be cleaned is adjusted in real time so that the focal plane of the cleaning laser beam 12 coincides with the corresponding position on the curved surface of the glass 13 to be cleaned.

[0057] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A laser dry cleaning method for fingerprint film on the glass surface of a touch screen, characterized in that, Includes the following steps: The glass to be cleaned is placed on a horizontal workbench, with the laser head positioned above the glass and used to direct the laser beam vertically downwards onto the upper surface of the glass. The laser's red light positioning mode is activated and a positioning beam is output to draw the laser action area and scanning path on the upper surface of the glass to be cleaned. Adjust the relative vertical height between the laser head and the glass to be cleaned so that the focal plane of the laser beam coincides with the upper surface of the glass to be cleaned; Set the process parameters for laser cleaning; The laser is activated in cleaning mode and outputs laser light. The laser head controls the cleaning laser beam to clean the fingerprint film on the upper surface of the glass to be cleaned according to the set scanning speed and preset scanning path. After cleaning is completed, the laser automatically stops outputting laser light.

2. The laser dry cleaning method for fingerprint film on touch screen glass surface according to claim 1, characterized in that, The method further includes: Depending on the surface condition of the glass to be cleaned after cleaning, the process can be selectively returned to the step of setting the laser cleaning process parameters for a second cleaning operation.

3. The laser dry cleaning method for fingerprint film on touch screen glass surface according to claim 1, characterized in that, The horizontal worktable is equipped with a Z-direction displacement control console, which includes a support platform, and the laser head is located on the support platform. The step of "adjusting the relative vertical height between the laser head and the glass to be cleaned" includes: The supporting platform is used to move the laser head vertically relative to the glass to be cleaned, so as to adjust the relative vertical height between the laser head and the glass to be cleaned.

4. The laser dry cleaning method for fingerprint film on touch screen glass surface according to claim 1, characterized in that, In the step of "activating the laser's red light positioning mode and outputting a positioning beam to draw the laser action area and scanning path on the upper surface of the glass to be cleaned": The laser action area and the scanning path are input through the controller, the position of the focal point of the positioning beam is adjusted, and the laser action area and the scanning path are drawn on the upper surface of the glass to be cleaned, with the laser action area covering the fingerprint film.

5. The laser dry cleaning method for fingerprint film on the surface of a touch screen glass according to claim 1, characterized in that, In the step of "setting the process parameters for laser cleaning": Depending on the different fingerprint film contaminants on the upper surface of the glass to be cleaned, the corresponding process parameters are set by the controller.

6. The laser dry cleaning method for fingerprint film on touch screen glass surface according to claim 4, characterized in that, The step of "inputting the laser action area and the scanning path via the controller" includes: The laser action area and the scanning path are drawn in the graphical interface of the controller; and / or The laser action area and the scanning path are defined by inputting parameters into the controller.

7. The laser dry cleaning method for fingerprint film on touch screen glass surface according to claim 1, characterized in that, In the step of "the laser head controls the cleaning laser beam to clean the fingerprint film on the upper surface of the glass to be cleaned according to the set scanning speed and preset scanning path": The controller sends the preset electrical signals corresponding to the laser action area and the scanning path to the laser head, and the galvanometer system built into the laser head controls the cleaning laser beam to scan according to the electrical signals.

8. The laser dry cleaning method for fingerprint film on touch screen glass surface according to claim 1, characterized in that, The laser is a carbon dioxide laser, and the glass to be cleaned is transparent quartz glass.

9. The laser dry cleaning method for fingerprint film on touch screen glass surface according to claim 1, characterized in that, The cleaning laser beam is a continuous laser beam with a wavelength of 10.6 μm or 9.8 μm, the average output power of the cleaning laser beam is 10 W to 200 W, the scanning speed of the cleaning laser beam is 100 mm / s to 10000 mm / s, the overlap rate of the cleaning laser beam spot is 0.3 to 0.7, and the spot diameter of the cleaning laser beam is 0.76 mm to 1.5 mm.

10. An apparatus for implementing the laser dry cleaning method for fingerprint film on the surface of a touch screen glass according to any one of claims 1-9, characterized in that, Includes laser, laser head, horizontal worktable and controller; The laser and the laser head are connected via optical fiber, and both the laser and the laser head are communicatively connected to the controller; the laser head includes an external optical path frame and a collimating mirror, a first reflecting mirror, a second reflecting mirror, an X-direction scanning galvanometer, a Y-direction scanning galvanometer, and a focusing mirror located within the external optical path frame and arranged sequentially along the optical path; The horizontal worktable is used to place the glass to be cleaned, and the laser head is located above the glass to be cleaned and can move vertically relative to the glass to be cleaned.

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